Spectroscopical and Electrochemical Behavior of New Mixed-Ligand Cyclometalated Rh(III) Complexes

Autor:	Mauro Maestri, D. Sandrini, Alex von Zelewsky, U. Maeder, Mauro Ciano
Rok vydání:	1990
Předmět:	Absorption spectroscopy Ligand Organic Chemistry Protonation Pyrazole Photochemistry Electrochemistry Biochemistry Medicinal chemistry Catalysis Inorganic Chemistry chemistry.chemical_compound chemistry Excited state Drug Discovery Physical and Theoretical Chemistry Luminescence Diimine
Zdroj:	Helvetica Chimica Acta. 73:1306-1313
ISSN:	1522-2675 0018-019X
DOI:	10.1002/hlca.19900730519
Popis:	The absorption spectra, luminescence spectra, excited-state lifetimes, and electrochemical behavior of the cyclometalated [Rh(ppz)2bpy]+, [Rh(3-Cl-ppz)2(bpy)]+, [Rh(4-NO2-ppz)2(bpy)]+, [Rh(ppz)2(biq)]+ and [Rh(4-NO2-ppz)2(biq)]+ complexes (ppz−, 3-Cl-ppz−, and 4-NO2-ppz− are the ortho-C-deprotonated forms of 1-phenylpyrazole, l-(3-chlorophenyl)pyrazole and l-(4-nitrophenyl)pyrazole, respectively) have been investigated. The results obtained have been compared with those concerning the free protonated ligands and some previously studied mixed-ligand cyclometalated Rh(III) complexes. Luminescence originates from the lowest ligand-centered (LC) excited state, which involves the diimine ligands in all cases except for [Rh(4-NO2-ppz)2(bpy)]+, where it involves the ortho-metalating ligand. s. In the absorption spectra, LC and metal-to-ligand charge-transfer (MLCT) bands, involving the diimine and/or the ortho-metalating ligands, have been assigned, and correlations between spectroscopic and electrochemical data are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::31cb14bb6b82c85156ebef0b53e5c483 https://doi.org/10.1002/hlca.19900730519 Zobrazit plný text záznamu Plný text